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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece61c71e19c402db4425d838d6167529809aebc5853e22c2684b816a5fc9981' 
  AND token = 'atGeAwdM/0erekB4bBLN+lanx10CSpiO5TsqUbWlo5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}